Well-casing puller



F. F. WELLMAN June 3, 1930.

WELL CASING FULLER Filed Aug. 15, 1928 l lill/11Min: lllllllrnlnl lr\|.. wmm

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INI/ENTOR B Y v man TTORN'EY June 3, 1930. F. F. WELLMAN WELL GASINGFULLER Filed Aug. 13, 1928 2 Sheets-Sheet 2 v /N VENTO/2 Wed F laye/Iman13% ATTORNEY Patented June "3, 1930 uNiTEnSfTA-TES- naman. WELLMN,OWICHITA, KANsAsf AssIeNoR To THEWEnnM-AN eAsrnev m :a sr-,EAR COMPANY,A CORPORATION or KANSAS 1 g v L .WELL-CASING :PULLEB Appiipamn neg Agust" 13,1. 192s.. fseriaif No. 299,218.; A'

This invention relates to easing pulling' devices, sometimes designateda casing spear, a device used for lowering'casing into `the oil well andfor jarring it loose preparatory to pulling it."l Broadly, the inventioncontemplates a body member carrying a plu.- rality lfexpanding andcontracting slips or jaws, the latter'being set into Vcasing engagingposition by overcoming the inertia of a spring balanced weight, themechanism being so constructed'that the'puller orl spear canv be causedto 'grip orv releaseV the casing as 'often as desired without thenecessity of withdrawing the tool 'from the well and since the slips orjaws are lmovable outwardly to an appreciable extent, the amplitude ofmovement is suficient'to serve for casings of different diameters, anvimportant feature since the number of pullers or spears required isreduced to a minimum.

Y The novelty ofithe invention will be clearly apparent yby referencetothe following description in 'connection withgthe aecompanying drawingsin which:

` Fig. 1 is a VertiCaLlongitudinal, sectional view through a well casingshowing the tool in position to vengage the interior wall of the casing.n FigL2fis7a'verticzal, longitudinal, sectional VGWhOUgh the tool. V

Fig. 3 isa fragmentary view showing part of ther spring balanced weight,one of the slips and a linl; connecting them.V I

' Fig, iis a sectionaly view on the line 1 4 Fig. 5 'is a sectional viewon the line 5- -5 ofFig. w i 'Y The tool is shown as'k comprisingaseotional hollow body consisting of a lower member l andan upper member2 screwed the slips or jaws to wedge betweenthe body together 'orotherwise' fastened together as indicated at 3. The lower member 1 hasya roimded noseA: relatively thick and provided with arecess 5. TheYupper member' 2 is tapered in anupward direction, being provided with aplurality ofV slip or jaw faces 6, 7 and 8, provided with dovetailedgrooves 9, 1() and 11.V Casing engaging slips or jaws 12, 13 and 14 rideon the tapered faces of the upper member 2 and they carry dove- Vuponythe yother en dof the spring. by means the weight.

f ward, causing the slips Orjawstoride down Atail keys- 15, 16, and 17to engage the respective grooves.'A The, curvatures of outer faces ofthe slips or jaws are approximately i equal to the curvaturev oftheinner face. of the casing.' Theouter face of` each' jaw is '5:5 providedwithteeth Y18 as will be well understood. The uppermember 2 is providedwith a head'1'9having a screwthread'ed projjeetion'20 which engages arod section'21 inan appropriate manner'.

' Inl screw threaded I connectior'ir with the head 19 is a vsuspendedrod Y22, thelower end of which is screw 'threaded asA at 23,'s`up.`.porting the weight 24 in the chamber25, formed bythe Alower V andluppermembers. The lscrew threadedend 23v carries Ya nut 26 upon which one`end .of av lspring 27, coiled about the rod 22,v rests; rEhe weight isseated vof the upper end 28 of thev recess 29 inthe i weight-24 so thatthe weight floats, on the spring. kEachslip or jaw carries ajstudfor pin30 which engages' a linkA connected to K There arethreeV links shown.These are vdesignated 31, 32 andA 33 and 'their lowerrends are receivedin recesses in the upper end of' the'weight andare secured thereto bythepins 34e ,Y '-f Normally, the expansive force of the spring'27 holdstheweight and jaws or slips 'high enoughso that the awsl or V'slips arein retracted position..V If the tool; is jerked-,upward slightly, theinertia' weightwilljtend to fremain stationary, yineffect. move downandoutwardly on the faces kof the upper ,Y

ymember 2l until the teethfof the slips or jaws Vcomeinto contact withthe rinterior I movement `'of the bodyfmember'will causeUO `v fao it ispositive in its action and that it can be rugged enough to meet alloperating requirements.

rllhe lock pin 81 prevents the members 1 and 2 from unscrewing. While Ihave shown the tool attached to a drill stem, it is obvious that-it canbe attached to casing; so I do not wish to be limited to the drill stem.

It will be observed that the upper ends of the slips or jaws 12, 13 and14 are beveled downwardly and outwardly so as to provide outwardlyinclined faces 35. This is for the purpose of preventing accumulation ofmud or deposits upon the slips and to permit the mud to free itself whenthe too'lk is raised in the well. It will, also, be obvious that the nut26 can be adjusted to vary the scale of the spring.

What I claim and desire to secure by Iletters Patent is y 1. A wellcasing pulling device comprising an elongated hollowA member havingtapered guide faces, casing engaging slips slidable on said faces, aweight within the hollow member connected-to said slips and a springsupporting said weight, the spring beingr collapsible when inertia ofthe weight is overcome to slide the slips into casing engaging position.

2. A well casing pulling device comprising an elongated member having atapered portion, casing engaging slips slidable on the tapered portionand anormally spring retracted slip actuating weight carried by theelongated member.

3. In a well casing pulling device ofthe character described, a bodystock adapted forattachment at one end to the operating rod or cable,a'cylindrical tapered extension depending from Ythe opposite end of saidbody stock, jaw members slidably arranged upon the outer face of saidextension, a

Vmember -depending from the center ofthe extension, a weight memberslidable upon said rst mentioned member,- means normally urging theweight member in an upward direction, and rigid connect-ions betweensaid'weight member and said jaw members, all in the manner and for thepurpose described.

4. In a well casing pulling device of the character described, a bodystock adapted for attachment at one end to the operating rod orY cable,a cylindrical tapered extension depending from the opposite end of said4body stock, jaw members slidably arranged upon the vouter face of saidextension, a weight; member slidable upon said pin,

l spring means normally urging the weight member in an upward direction,and opferative connections between the weight member and said slidingjaw members whereby to normally urge the Jaw members Y in an upwarddirection.

5. In a well casing pulling device of the character described, a bodystock'adapted for attachment at one end to the operating rod or cable, acylindrical tapered extension depending from the opposite end of saidbody stock, jaw members slidably arranged upon the outer face of saidextension, an elongated pin depending from the center of said extension,a weight member slidable upon said pin, spring means normally urging theweight member in an upward direction, operative connections between theweight member and said sliding jaw mem-V bers whereby to normally urgethe jaw members in an'upwardV direction, and a cylindrical kcupdetachably associated with the lower end of said extension for inclosingsaid weight member and its associated elements.

6. In a well casing pulling device of the character described, a bodystock adapted to be attached at its upper end to the raising andlowering rod or cable, an inverted conical shaped cylinder dependingfrom the lower end of said body stock, the outer face of said cylinderbeing formed with longitudinally extending channels, casing gripping jawmembers slidably arranged upon the outer face of said cylinder, ribsupon the inner faces of said jaw members for slidable engagement withinthe channels, a depending supporting member ,associated with the innerend of said cylinder, a weight slidable upon said supporting member,means normally urging the weight in an upward direction, and operativeconnections between said weight and sliding jaws. A

7. In a well casing pulling device of the class described, a body stockvadapted for attachment at one end to an operating'rod or cable, saidbody consisting of a hollow member tapered at its upper end toward thecenter of the body and provided with a plurality of slip faces havingdove-tailed grooves, casing engaging slips slidable on the faces andhaving ldove-tailed keys to engage the grooves, a rod suspended fromVthe top of the body within the hollow portion, a sliding weight on therod, an adjustable nut on the rod below theweight, aV coil springbetween the nut and the weight, pins connected to the inner faces oftheV`slips and links betweenthe pins and the weight. Y

In testimony whereof Il aiiix my signature.

' FRED F. WELLMAN.

